Added check for tags and information for them

git-svn-id: http://svn.d4science-ii.research-infrastructures.eu/gcube/trunk/portlets/widgets/ckan-metadata-publisher-widget@129239 82a268e6-3cf1-43bd-a215-b396298e98cf

.classpath

@@ -20,6 +20,7 @@
 	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
 		</attributes>
 	</classpathentry>
 	<classpathentry kind="lib" path="/home/costantino/Downloads/gwt-2.7.0/gwt-user.jar">

src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/CreateDatasetForm.java

@@ -878,6 +878,9 @@ public class CreateDatasetForm extends Composite{
 			// ckan accepts only alphanumeric values
 			if(!itemBox.getValue().matches("^[a-zA-Z0-9]*$"))
 				return;
+			
+			if(itemBox.getValue().length() <= 1)
+				return;
 
 			final String value = itemBox.getValue();
 			final ListItem displayItem = new ListItem();

src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/CreateDatasetForm.ui.xml

@@ -87,6 +87,15 @@
 						<b:TextBox alternateSize="LARGE"
 							placeholder="Enter one or more tag for the dataset" b:id="tags"
 							ui:field="tagsEnterTextBox" />
+						<span style="float:right; width:256px; color: #aaaaaa;">
+							<b:Icon type="INFO_SIGN" size="TWO_TIMES" />
+							Tags are meaningful information that can be associated to the
+							dataset and by means of them
+							it can be retrieved. A tag cannot
+							contain white spaces and can contain only alphanumeric
+							characters.
+							It must be at least of two characters.
+						</span>
 					</b:Controls>
 				</b:ControlGroup>